During his lectures Turner perhaps pointed at the upper part of the room as he explained: 'The upper line of cornice to all those seated in [the] centre appears to dip each way, and the underneath part or lines appear to approach each other as they recede from the eye.' In spite of this, the rules of do not depict such lines as converging if the building is parallel to the , but as strictly horizontal on the picture surface, as Turner shows here.
Gallery label, August 2004
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